diff --git a/wscript b/wscript
index 6af0c9c4..1b03c187 100644
--- a/wscript
+++ b/wscript
@@ -409,7 +409,7 @@ def setup_environment(ctx):
     ctx.env.LIB_default       = ['rt'] if ctx.env.USING_IPCSHM else []
     ctx.env.LINKFLAGS_default = ['-pthread']
 
-    ctx.env.DEFINES_default   = ['_LARGEFILE_SOURCE', '_FILE_OFFSET_BITS=64']
+    ctx.env.DEFINES_default   = ['_LARGEFILE_SOURCE', '_LARGEFILE64_SOURCE', '_FILE_OFFSET_BITS=64']
     for k in ctx.env.keys():
         if k.startswith('USING_'):
             if getattr(ctx.env, k):
diff --git a/zcm/util/topology.hpp b/zcm/util/topology.hpp
index 552d5c0b..f9b063eb 100644
--- a/zcm/util/topology.hpp
+++ b/zcm/util/topology.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <functional>
 #include <string>
 #include <unordered_map>